中国城市建成区面积二十年的时空演变

Twenty Years' Spatio-temporal Evolution of Urban Built-up Areas in China

根据《中国城市统计年鉴》数据,以中国大陆地区各省城市建成区面积为研究对象,选取建成区扩展速度、扩展系数,以及国家对土地征用面积的大小,城市人口密度等因素来综合分析1986—2006年间全国城市时空扩展过程,结论:(1)国家对土地的征用面积因时而异是造成建成区面积各年份不同扩展速度的直接原因;(2)中国城市建成区面积的空间差异相对比较明显,扩展速度也有很大差别;(3)自1986年以来,中国城市用地扩展系数平均为1.3,表明中国城市用地扩展速度相对偏快.

According to the China urban statistical yearbook,by taking each province＇s urban built-up areas as a research object,and by selecting the factor of expanding rate of urban built-up,spreading coefficient,density of population and land requisition area to analyze the course of China urban built-up spreading,we draw the following conclusions：（1） The area of land requisitioned by the state varies with the time,which is the main reason for different expanding rate of urban built-up area each year.（2）Relatively,the spatial difference of our urban built-up area is more obvious as well as the spreading rate of urban built-up area.（3） Since 1986,the average indicates of the urban land expansion coefficient is 1.3,which shows that urban expansion rate is relatively rapid.